Door-bolt.



MICHAEL V. ROWE, OF CHICAGO, ILLINOIS.

DOOR-BOLT.

Specification of Letters Patent.

Patente'd Dec. 5, 1911.

Application filed November 7, 1910. Serial No. 591,074.

To all whom tt may conccrn:

Be it known that I, MICHAEL V. CRown, a citizen of the United States,and a resident of the city of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inDoor-Bolts, of which the following is a specification.

My invention relates to improvements in door-bolts, and consists in thenovel construction and arrangement of parts as will be hereinafter fullydescribed and more particularly pointed out in the appended claim.

My invention will be more readily understood by reference to theaccompanying drawings forming a part of this specification and in which,

Figure c1 is a front elevation of my improved door-bolt in its preferrdform, Fig. 2 is a transverse section of the door and door-casing showingthe door partly open, Figs. 3 and 4 are detail elevations, and Fig. 5 isa detail sectional elevation.

The preferred construction for carrying my invention into eifect asillustrated in the accompanying drawings comprises a door 1 and adoor-casing 2 therefor. Secured to the door-casing 2 is a face molding 3to which is screwed a member 4, one end of the latter constituting astriker for the looking bolt to be described hereinafter. Hinged to themember is a substantially L-shaped perforated member 6, the perforations7 of which are elongated as shown in Fig. 1. Screwed to the face of thedoor 1 is a casing 8 in which is mounted a slidable bolt 9 having anOperating handle 10 projecting therefrom. The handle 10 is adapted torotate the bolt 9 through a partial revolution as is obvious from theside view.` One end 11vof the bolt 9 is T-shaped in form and adapted toregister with and to fit into a perforation 7. The other end of the bolt9 is flattened as at 12 for the reception of a swinging latch 13 whichis adapted to engage said fiattened portion after the end 11 has beenturned into locked position in the member 6 by means of the handle 10.Since gravity holds the latch 18 in engagement with the fiattenedportion 12 of the bolt 9 the latter cannot turn, consequently theengagement of the end 11 with a perforation 7, as shown in Fig. 2 issecure.

In Operation when it is desired to lock the door 1 in closed positionthe bolt 9 is moved into engagement with the striker 5 in the ordinarymanner, this function of the slidable bolt 9 being old and well known inthe art. WVhen it is desired to lock the door slightly aj ar, as shownin Fig. 2, the member 6 is moved from the dotted line or normal positioninto the full line position and engaged with the bolt 9 as hereinbeforedescribed. By making the member 6 L-shaped, room is provided forinsertion of the striker 5 and said member may be turned back completelyout of the way when not in use.

It is apparent that a person from the outside would not have access tothe locking latch 13, hence the door can only be opened by a person onthe inside.

A door-bolt of the construction set forth is simple of construction andefficient in operation.

Having described my invention what I deem as new and desire to secure byLetters Patent is:

The combination with a door and doorcasing therefor, of a slidable boltmounted on said door and adapted to lock by rotation; means for rotatingsaid bolt for locking the same; and a pivoted latching plate arranged toswing to engagement under the rear end of said bolt, the rear end ofsaid bolt being flattened to engage said plate to prevent rotation ofsaid bolt, substantially' as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MICHAEL V. CROWE.

Witnesses HELEN F. LILLIs, J osHUA R. H. PoTTs.

Gopies of this patent may be obtained for five cents each, by addressng'the Gommissioner of Patents, Washington, D. 0.

